Centering-machine.



R. MILNE. GENTBRING M'AGHINE. APPLIOATION FILED MAY 2z. 190e.

Patented A11-g. 23, l1910.

2 SHEETS-SHEET 1.

Wmesses w R. `MILNE.

CENTEBING- MACHINE.

APPLICATION FILED KAY 22, 1908. Aug.. 23

Cil

ROBERT MILNE, F ROCKFORD, ILLINOIS, ASSIGNOR TO ROCKFORD DRI LING MACHINE COMPANY, A CORPORATION OF ILLINOIS.

CEN TERING-MACI-IIN E.

To all whom it may concern:

Be it known that I, ROBERT MILNE, a citizen of the United States, residing at Rockford, in the county of Winnebago and State of Illinois, have invented cert-ain new and useful Improvements in Centering-Machines, of which the following is a specification.

This invention is intended primarily for use in rounding off the ends of rods or spindles and thereafter drilling a counter-bored hole adapted to receive the tail stock of a lathe in the subsequent milling or turning of the work.

The object of the invention is to facilitate these operations and at the same time provide means whereby the counter-bored holes will be drilled exactly in the center of the end of the rod or spindle, and to provide means whereby the revolving` work will be held rigidly and exactly in position to receive the bit during the drilling operation.

The invention further relates to the construction and arrangement of the tail stock of the machine whereby bits or tools of different sizes can be alternately thrown into clutch with the tail driving machanism and positioned to drill, in the end of the work, holes of varying shape or diameter.

The invention also relates to the construction and arrangement of the adjustable steady rest which receives and holds the end of the work during the application of the drill thereto.

The invention consists in the features of construction and combination of parts hereinafter described and claimed.

In the drawings, Figure l is a side eleva.- tion of the entire machine, with the exception of a portion of the trackway and t-able, which are broken away; Fig. 2 a cross sectional view showing the steady rest for holding the work positioned; Fig. 3 a longitudinal sectional view of the steady rest and the adjustable slide mounted thereon; Fig. 4 a longitudinal sectional view of the tail stock; Fig. 5 a top or plan view of the same; Fig. 6 a rear face view of the eccentric bit mounting; Fig. 7 a view taken on line 7 7 of Fig. 6 looking in the direction ofthe arrow; and Fig. 8 a cross sectional view taken through the eccentric bit mounting on line SS of Fig. 4, looking in the direction of t-he arrow.

The machine as a whole is mounted upon Specification of Letters Patent. Application led May 22, 1908.

Patented Aug. 23, 1910. semi No. 434,363.

a table comprising side rails 9 and legs or uprights 10. The side rails are provided, at the top, with outer overhanging flanges 11 and inner overhanging flanges l2, the top surfaces of the companion rails furnishin a trackway for the support of mechanism mounted thereon. The outer iiange 11 is provided, on its under face, with teeth 13 which furnish, in effect, al rack extending from end to end of the table. At one end of the table is located a head stock 14 comprising a universal chuck 15, of standard formation, mounted upon a shaft 16 carrying a cone pulley wheel 17. The head stock is of a style ordinarily used with lathes and need not be described more fully in detail. The tail stock 18 is mounted upon a frame 19 comprising a bearing head 20 carried by feet 21, which feet are connected by a floor 22 and a front wall 23. The lioor rests upon the surface of the side rails at the table, and the frame is held in position by means of a bolt 24 entered through a clamping plate 25 and through the ioor, the ends of which clamping plate engage the overhanging inner Hanges 12 of the side rails. The bearing movable within the bearing head but is held against rotation by means of an elongated spline 27. The bearing sleeve 26 serves as a journal mounting for a shaft 28 which carries a grooved pulley wheel 29 splined to an elongated sleeve 30 which is journaled within a journal bearing 31, which journal bearing is connected with the main journal head 20 by a bent arm or elbow 32 which embraces the grooved pulley wheel. The end of the shaft 2S is provided with a groove 33 which receives a ring 34 carried by a lever 35 which is provided, at a suitable point, with a forked head 36 which embraces the ring 34. he rear end of the lever is pivoted to a link 37 which in turn is pivoted to a tongue 38 outwardly extending from the journal head.

sleeve 26 is enwithin a socket eccentrically positioned upon a 40. The clutch head serves 'as a mounting for an adjustable bit socket 4l which comprises a recessed body 42 mounted upon the clutch head 40, which body has forwardly projecting there from a double sleeve member 43 which is bored out to provide bit bearings 44 and 45, which bearings receive bit holders 46 and 47, respectively. The bit bearings are positioned equidistant from the center of the circular clutch head 40 so that either of the bit bearings may be brought into register with the end of the shaft 28. The end of the shaft is provided with an enlarged toothed clutch member 48 which is adapted to engage with either the clutch member 49 or the clutch member 5() formed on the bit holders 46 and 47, respectively. rlhe clutch members 49 and 50 are each provided with a bearing ring 51, and the clutch members, being of larger diameter than the bit bearings 44 and 45, are revoluble within en larged bearing recesses 52 and The clutch members are entirely housed within the recesses provided therefor, so that the entire bit holder can be revolved around the circular clutch? head 40 as a bearing when it is desired to throw one or the other of the bits into commission. ln order to hold the parts in adjusted position, a pin 54 is provided which is entered through a hole in the clutch head and is adapted to register with either one of two holes 55 in the recessed body of the bit holder, which pin serves to hold the bit holder' in position to bring either of the bits into register with the end of the shaft. In order to facilitate the ad justinent, a pivoted lever 56 is provided, the

end 57 of which is forked to receive the end of the pin. The lever 1s pivoted between ears 58 and is held in position to normallyT project the pin into one of the holes 55 by means of a spring 59 which bears against the free end of the lever. The handle of the lever is adapted to be engaged by a stop 60 which forwardly projects from the frame 19 of the tail stock, which stop acts against the lever and automatically serves to disengage the bit holder and permit it to be readjusted when the parts have been retracted to their rearmost position, as will be more fully exlained.

The steady rest 61 is in the form of an adjustable frame 62 comprising an upright transversely extending wall 68 mounted upon a base plate 64 which rests upon the top of the side rails as a bearing. r1`he base plate, on its forward side, has depending therefrom a bracket arm 65 which overhangs the rack 18 and affords a bearing for an ad justing pinion 66 and an intermediate meshing pinion 67, which latter meshes with the rack. The adjusting pinion is located upon a shaft 68 which carries a handle 69 which, being revolved, serves to adjust the frame along the table to any desired position, the intermediate pinion being provided to impart travel in the direction of rotation of the handle. The base plate 64 is adapted to be held in adjusted position by means of a clamping plate 70 which has a bolt 71 entei-ed therethrough. The wall 63 is provided, at its upper edge, with a recess 72 adapted to receive a half ring bushing 7 8 of suitable size to accommodate the diameter of the intended work. rlhe bushing cooperates with a pair of rollers 74 which are journaled within a recess 75 in a jaw 76 which is hinged by means of a pivot pin 77 to the rear side of the frame and is adapted to be held in clamped position by means of a hinged clamping bolt 78 positioned to engage a slot 79 in the free end of the jaw. The rollers 74 are pivoted at the ends of a pair of obliquely extending adjustable blocks 80 which are slidably mounted within recessed guideways 81 in the jaw and are held against displacement by means of bolts 82 entered through slots 83 in the blocks. Retraction of the blocks is prevented by means of end screws 84 which bear against the ends of the blocks, as shown in' liig. 2. The wall 68 is provided, on the side adjacent the tail stock, with horizontal guideways 85 which afford a mounting for a slide 86 adapted to be laterally adjusted by means of a screw 87 entered through the slide, the movement ol which slide, in opposite directions, is adapted to be limited by means of a forward stop 88 and a rear stop 89.

rlhe slide is provided with an upwardly projecting tongue 90 which is bored out to receive a hardened bearing ring 91 which, when the slide has been thrown to its forward position, will be exactly in register with the end of the work supported upon the bushing 7 8 and held in position by the adjustable rollers 74. The slide is further provided with a cut-ting tool 92, the inner end of which is adapted to be brought into engagement with the work as the slide is moved toward its rearmost position, so that, as the final limit of rear movement of the slide is reached, the tool will have completed its cutting operation and will be brought to the center of the work. The tool is clamped in position by means of a plate 98 located on the top of the slide.

The machine can, if desired, be provided with a cut-off 94 which comprises an adjustable frame 95 and a slide 96 having a tool post 97 adapted to receive a tool 98 for cutting olf the stock, or forming it, or both. The slide is provided with an adjusting screw 99, whereby its position with respect to the work can be adjusted. The cut-off mechanism, however, is of ordinary standard type and can be dispensed with without affecting the remaining portions of the ma chine.

In using the machine of the present invention, the work, which is usually in the form of a raw rod or spindle, is positioned within the machine and its head end secured by the head chuck. rl`he center rest is then moved to a position in which the tail end of the rod or spindle will project slightly beyond the bushing 72, after which the hinged jaw is brought down and the rollers 74 adjusted to bear firmly against the work. The rollers are provided so that a firm pressure can be brought to bear upon the work without marking it, which might be the case if a non-rotatable bearing block were provided. After the tail end of the work has been thus firmly clamped, t-he head chuck will be revolved and the slide carrying the tool advanced to a suitable position to round off or otherwise finish t-he end of the rod or spindle. After the spindle has thus been finished the slide will be retracted to the limit of its movement, which brings the bearing ring 91 into exact register with the end of the work, after which a hole or holes can be drilled in the center of the end of the rod or spindle in position to receive the tail bearing of the lathe.

The drilling operation is performed by adjusting the bit socket in Such position on the clutch head as to bring the desired bit into register with the clutch end of the shaft 28. The shaft 28 will be constantly revolved in a direction opposite the travel of the work, which revolution will be imparted to the shaft through the sleeve 30 which is keyed to the grooved pulley wheel 29 and also to the shaft itself. When it is desired to bring the bit into position for drilling, the lever 35 will be pulled forward, which imparts a longitudinal movement to the shaft 28, which initially engages the clutch members and thereafter carries forward the slidable sleeve 26 and with it the clutch head and bit socket, thereby maintaining the shaft in clutch with the bit holder, which for the time being registers therewith, and imparting rotary movement to the intended bit. In finishing the ends of rods or spindles for the lathe, it is customary to drill a small hole sufficiently deep to afford a clearance for the point of the tail stock of the lathe, and then, by a second drilling operation, to ream out the edge of the hole by means of a larger bit. In using be the device of the present invention for the above purpose, a hole will be drilled with a smaller bit and thereafter the shaft will be drawn back, carrying with it the sleeve and connected parts, and, as the sleeve is drawn th to within the ring 91, during the ation. rection and the drill in the opposite dii'ection, and this fact center the holes and tates the drilling operation by doubling the drilling speed.

by Letters combination of movable drill slide carried by and adjustable across the steady rest, and provided with a cutting tool adapted to engage the work vided with an ste rest and provided with a cutting' tool adapted moved to one formed on the steady rest serving as a guide and support for ing beveled side back, the end of the lever 56 will be brought into contact with tinued movement tracts the pin 54, thereafter allowing the bit the stop 60 so that conthrows the lever and recket to be turned around the disk-shaped clutch head as an axis until the second drill holder is brough clutch end of the ond t into register with the shaft, after which the secdrilling oper-7 The work will be rotated in one difurther tends to properly at the same time facilihe invention is one which enables the operations above mentioned to be performed with very little manipulation on the part of e drilling perfectly performed at all times. IVhat I regard as new and desire to secure Patent is:

In a machine of the class a head chuck,

mechanism, a

described, the longitudinally steady rest, a

when the slide moved to one position, and a tongue proopening adapted to receive e end of the drill when the slide is moved another position, substantially as described.

2. In a machine of the class described, a ady rest, a slide movable across the. stead'v the slide is and a member to engage the work when position,

said slid-e, said memberhavwalls adapted to engage the veled side walls of a recess formed in the slide, substantially as described.

ROBERT MILNE. vWitnesses SAMUEL H. RECK, IVALTER B. BIRNE. 

